PREFACE ix 



182; copepods, 146, 146a; ostracods, 147; other Entomostraca, Herrick 

 and Turner's ('95) synopsis for Minnesota. 



In the case of several names not included in any of these works there 

 are contradictory spellings, authors, etc., and we have used some name 

 which we believe will be understood. 



In bringing together the illustrations, material assistance has been 

 rendered as follows: 



Dr. S. W. Williston, loan of Figs. 30, 31, 32, 126, 132, 174, 186, 187, 188, 210, 

 267, 269, 270, 271, 272, 273, 274, 275, 282, 283, 284, 285, 286, from his 

 Manual of North American Diptera. 



Dr. F. R. Lillie and the Biological Bulletin, loan of Figs. 66, 67, 68, 69, 8s, 84, 

 85, 101, 251, 252, 253, previously published by the author in the Biological 

 Bulletin. 



Professor S. A. Forbes, the Illinois State Laboratory, and the State Ento- 

 mologist's Office, loan of Figs. 35, 36, 44, 45, 46, and 72, which appeared in 

 Vol. Ill of the Natural History Survey of Illinois, and for electrotypes of 

 Figs. 261, 262, 264, 265, 288, 289, 290, 291, 292, 296, 297, 301, 302, 303, 304, 

 305, 306, which appeared originally in the Annual Reports and Bulletins 

 of the State Entomologist and other state and national publications. 



Professor S. E. Meek and the Field Museum, loan of Fig. 37. 



Professor J. M. Coulter and the Botanical Gazette, loan of Fig. 115. 



Professor F. L. Washburn and the Minnesota State Entomologist's Office for 

 electrotypes of Figs. 136, 137, 156, 189, 194, 211, 212, 213, 229, 256, 263, 

 266, 268, 276, 277, 278, 293, 298, 299, 300. 



Professor Vernon L. Kellogg, privilege of using Figs. 188, 270, 271, 274 from 

 North American Insects, which appear also in Williston's Manual of 

 North American Diptera. 



Professor J. H. Emerton, privilege of using Figs. 207, 208, 224, 225 ixom.Com- 

 mon Spiders. 



Figures after Lugger appeared originally in Bulletins $f, 66, and 6g and the 

 Fourth Annual Report of the Minnesota Agricultural Experiment Station. 



Figures after Marlatt, Riley, and Chittenden appeared originally in publica- 

 tions of the U.S. Department of Agriculture; after Gorham, Smith, 

 Jennings, and Reighard, in publications of the U.S. Fish Commission. 



The author is also indebted to Dr. J. P. Goode, Dr. Otis W. Caldwell, 

 Dr. H. C. Cowles, Professor R. D. Salisbury, Professor C. M. Child, 

 and Mr. M. M. Wells for assistance in editing the manuscript and read- 

 ing proof. Mr. W. J. Gerhard rendered special assistance in the reading 

 of the proof of the scientific names. 



It is evident from the number of persons who have assisted in the 

 working over of material and the accumulation of the data on which this 



